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CBCT Basic.pptx
- 2. Introduction CBCTVs MDCT Basics of data acquisition and reconstruction Image Display Field ofView (FOV) Image interpretation Anatomic landmarks Clinical applications
- 4. 2DVs 3D
- 5. OPGVs CBCT 3D analysis No superimposition No distortion,True size images ability to create cross-sectional images.
- 6. TOMOGRAPHY Shape of x-ray beam Multiple sections of the object
- 8. CBCT Cone- shaped X-ray beam a single rotation Isotropic voxels MDCT Fan-shaped x-ray beam many rotations Non-isotropic voxels
- 16. Two-dimensional (2D) panoramic reconstruction
Editor's Notes
- Laymen- man Detective –looks like shadow of a man, casually dressed, 5 feet 4 inch approx height.. Radiologist says..all that is good But kindly correlate clinically
- Shadow – assemblage of obscured items.. IOPA< OPG< CBCT 2D image- shadow + intelligence provided by us
- Imaging objects lying within a plane of interest
- The pixel "picture element" is the basic unit of a digital image on a computer display.
- cone-shaped X-ray beam is used which orbits around the patient obtaining data in a cylindrical volume.
- the computer divides the cylinder into tiny cubes or voxels.
- the computer creates separate images along the sagittal, coronal and axial anatomical planes.
- Most scanner programs display a image reconstruction of the object in the 3 anatomic planes of imaging: the axial, sagittal, and coronal planes.
- Most CBCT softwares display images in three orthogonal planes (axial, sagittal, and coronal) and 3 D image
- Panoramic line is drawn over selected axial image centre of the arch.. As a result we get 2D panoramic reconstruction. Thickness of this can be changed.
- Buccolingual cross-sectional images are created perpendicular to panoramic line. The axial and panoramic images are used as reference images to show the exact location of the cross-sectional images. There are numbers given on cross sections which correspond with these reference lines.
- MPR …oblique axial, oblique sagittal and oblique coronal planes.. this feature can be used to localize an object or in this case, impacted tooth.